Phonograph-record.



H. SCHRGDER.

PHONOGRAPH RECORD.

APPLICATION FILED APEA, nos.

909,461 Patented Jan. 12, 1909.

HERMANN SGHRUDER, OF NIEW YORK, N. Y.

PHONO GRAPH-RECORD.

Specification of Letters Patent.

Patented Jan. 12, 1909.

Application filed April 4, 1908. Serial No. 425,266.

To all whom it may concern:

Be it known that I, HERMANN Sonatimm,

citizen of the United States, residing at New York, in the county of NewYork and State of New York, have invented certain new and usefulImprovements in Phonograph-Records, of which the following is aspecification.

This invention comprehends certain new and useful improvements in recorddisks for phonographs, and the invention has for its object an improvedconstruction of record disk which may be cheaply, manufactured and whichwill be light and yet stifl or rigid and capable of resisting hard usewithout breaking.

With this and other-objects in view, the invention consists in certainconstructions, arrangements and combinations of the parts that will behereinafter fully described and then claimed.

For a full understanding of the invention, reference is to be had to thefollowing descrlption and accompanying drawings, in which:

Figure 1 is a top plan view, partly broken away, of a phonograph recorddisk embody ing the improvements of my invention; Fig. 2 is a transversesectional view thereof; and, Fig. 3 is a sectional view.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

In carrying out my invention, I employ a foundation plate 1 of anydesired size, according to the record that is performed, said .platebeing constructed of relatively thin sheet metal and being disk-like orcircular, as shown and formed with the usual center opening 2. Thefoundation plate 1 is formed with a series of radially extendingcorrugations 3 which begin at the margin of the plate and terminateshort of the center thereof, said corrugations serving to stiffen theplate and permitting. a relatively light stock to be used. In additionto the corrugations 3, the plate 1 contains a plurality of radiallyextending rows of perforations 4 serving as bonding openings for theplastic composition 5 forming the body portion or surface of the disk,the said embedded in said composition and the latter plate 1 beingextending through all of the perforations, as clearly illustrated in thedrawing.

From the foregoing description in con; nection with the accompanyingdrawing, it will be seen that I have provided a very simple and durableconstruction of record disk for phonographs, which may be very cheaplymade, the foundation plate 1 being of relatively light sheet metalstiffened by the corrugations 3, and firmly embedded in the plasticcomposition of the disk, such composition being anchored securely to theplate by means of the perforations 4 and the composition passingtherethrough, the Whole forming a record disk that is light and yetstiff or rigid and capable of withstanding hard use.

It isto be understood that the body portion of the disk in which theplate 1 is embedded may be of any desired composition, either for softor hard records.

It is also to be understood that with this improved record,.a stone isto be used instead of a needle and that the grooves are so arranged thatthe stone will start at the center of the record and run to the outeredge thereof instead of from the outer edge to the center.

Having thus described the invention, what is claimed as new is:

1. A record disk of the character described, embodying a body portionand a foundation plate embedded therein, said plate being formed with aseries of radially extending corrugations.

2. As a new article of manufacture, a foundation plate for record disksformed with radial corrugations and radially extending series ofperforations.

3. A record disk of the character described, embodying a body portionand a foundation plate embedded therein, said plate being provided withperforations through which the composition of which the body portion isformed passes, said plate being also formed with radial corrugations.

In testimony whereof I afiix my signature in presence of two witnesses.

HERMANN scuaenma. [a 5.]

